JP3536566B2 - Washing machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a washing machine to make washing, rinsing, and spin drying of clothes within a drum installed rotatably around a horizontal shaft, in which generations of large vibrations and noises in the spin drying process are precluded by sensing the situation of the wash put in the drum before entering the spin drying process. SOLUTION: The wash is accommodated in a drum 1 and rotated round a horizontal shaft by the first 15 and the second motor 16 at the first and the second revolving speed, wherein the revolving speeds of the first motor 15 and second motor 16 are controlled by a control means provided in a control device 20. The control means senses the angle of electric continuity with which the drum 1 is controlled to the specified revolving speed and judges the situation of the wash in the drum 1 with the revolving speed varying width when the drive is made with this angle of electric continuity.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention is rotating freely arranged, to dropping the laundry lifted by rotation
The present invention relates to a washing machine for washing, rinsing, and dehydrating laundry in a drum for washing.

[0002]

2. Description of the Related Art Conventionally, this type of washing machine has been configured as shown in FIG. Hereinafter, the configuration will be described.

[0003] As shown in the figure, a drum 1 has a large number of water passage holes 2 provided on the entire outer periphery thereof and is rotatably disposed in a water receiving tank 3. One end of a horizontal shaft 4 is fixed to the rotation center of the drum 1, and a drum pulley 5 is fixed to the other end of the horizontal shaft 4. The motor 6 is connected to the drum pulley 5 by a belt 7 and drives the drum 1 to rotate. A cover 8 is provided at the opening of the drum 1 so as to be freely opened and closed.

The water receiving tub 3 is provided with a spring body 1 from the washing machine body 9.
The washing machine is suspended at 0 and is supported by a vibration isolator damper 11 so that vibration during dehydration is not transmitted to the main body 9 of the washing machine, and a weight 12 for reducing vibration during dehydration is provided. The heater 13 heats the washing water in the water receiving tub 3. The control device 14 controls operations of the motor 6, the heater 13, and the like, and sequentially controls a series of processes such as washing, rinsing, and dehydration.

The operation of the above configuration will be described.
, The laundry is put into the drum 1 and the operation is started. In the washing process, the drum 1 is driven to rotate at a low speed by the motor 6, and the laundry in the drum 1 is lifted and dropped on the water surface. . Thus, the washing process proceeds. The same operation as the washing process is performed in the rinsing process. In the dehydration process, the drum 1 is driven to rotate at high speed, and the laundry is centrifugally dehydrated. At this time, the laundry in the drum 1 is biased,
That is, when imbalance occurs, the drum 1 and the water receiving tub 3 vibrate, but the vibration is attenuated by the vibration damper 11 and is not transmitted to the washing machine main body 9.

[0006]

In such a conventional configuration, the rotation speed of the drum 1 is about 53 rpm during the washing process.
In the dehydration process, the rotation speed is about 1000 rpm. When the laundry in the drum 1 enters the dehydration process in a tangled state in the washing process, the imbalance occurs because the laundry in the drum 1 is not evenly distributed in the dehydration process. When dehydration is started in an unbalanced state, a large vibration is generated at a rotation speed corresponding to a vibration resonance point of the water receiving tub 3 or the like, and when the vibration of the water receiving tub 3 is large, the vibration hits the washing machine main body 9 and an impact sound is generated. In addition to the occurrence of abnormal noise, the rotation speed of the drum 1 cannot be accelerated beyond the rotation speed corresponding to the vibration resonance point, and there is a problem that a predetermined dehydration performance cannot be obtained.

Further, even if the rotation speed of the drum 1 can be accelerated from the rotation speed corresponding to the vibration resonance point, when the drum 1 is rotated at a high speed, the laundry in the drum 1 may be unbalanced. Vibration of the water receiving tub 3 and the like becomes large, and this vibration is transmitted to the floor on which the washing machine is installed, and the whole floor vibrates, and this vibration has a problem that loud noise is generated.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned conventional problems, and an object of the present invention is to detect the state of laundry in a drum before entering a dewatering process so as not to generate large vibration and noise during the dewatering process. I have.

[0009]

SUMMARY OF THE INVENTION The present invention, in order to achieve the above object, accommodating the laundry into the drum times the laundry
Wash by rolling up and dropping
And rotatable, the rotation speed of the motor by the rotation speed detecting means
And the signal from the rotation speed detection means is input
Next, the number of rotations of the motor is controlled by the control means. The control means controls the rotation of the drum corresponding to the vibration resonance point such as a water receiving tank.
Power switch when the number of rotations is lower than the number and the laundry is controlled to rotate at a predetermined number of rotations sticking to the inner wall of the drum
Detects the conduction angle of the ring means, the ratio of the rotational speed variation range and a predetermined value of the motor when the <br/> driving the motor in this conduction angle
By compare, unbalanced by the laundry in the drum
This has an unbalance determination step of determining the state of the engine .

Thus, the state of the laundry in the drum can be accurately detected based on the fluctuation range of the rotation speed of the drum before the dehydration step is started. Vibration and noise can be prevented.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS According to the first aspect of the present invention, laundry is stored and the laundry is lifted by rotation.
A rotatable drum for washing by dropping, a motor for driving the drum, and a washing machine containing the drum for washing
Driving the motor and the water receiving tank supported on the main body
Power switching means, and the number of rotations of the motor.
A rotation speed detecting means for detecting the rotation speed;
Signal and the power switching means.
Control means for controlling the conduction angle, the control means,
The drum corresponds to a vibration resonance point of the water receiving tank or the like
The laundry speed is lower than the rotation speed and the laundry sticks to the inner wall of the drum.
When the motor is controlled to rotate at a predetermined speed.
The conduction angle of the power switching means, and
Engine speed fluctuation width of the motor when driving the motor
And the predetermined value is compared with the laundry in the drum.
Unbalance judgment to judge the state of imbalance due to
Are those that have a stroke, since when imbalance of laundry in the drum, the larger the load variation applied to the motor, the rotation speed variation width is large when driving the motor at the detected conduction angle, the unbalance since the rotational speed fluctuation width is small is smaller, the rotation speed variation width can be detected state of the laundry in the drum, it is possible to determine whether to transition to the dehydration step, also, a predetermined rotation The number is
This is the number of rotations at which the laundry sticks to the inner wall of the drum.
Change the state of laundry sticking to the inner wall of the drum
No, the rotation speed fluctuation width at the predetermined rotation speed
Since it is possible to determine the state of the laundry, it is possible to accurately determine whether or not the shift to the dewatering process is possible, so that large vibration and noise are not generated in the dewatering process.

According to a second aspect of the present invention, in the first aspect of the present invention, the control means includes an unbalance determination line.
In extent, when the rotation speed variation width of the motor is greater than a predetermined value, the unbalance due to the laundry in the drum is a large determination
And the drum corresponds to a vibration resonance point such as a water receiving tank.
Shift to the dehydration process that rotates at the second rotation speed higher than the rotation speed
Is obtained by so as not to a large load fluctuation acting on the motor when imbalance of laundry in the drum is large, the rotational speed variation range when driven with the detected conduction angle is large, when the imbalance is small The rotation speed fluctuation width becomes smaller. Therefore, the state of the laundry in the drum can be detected from the rotation speed fluctuation range. When the rotation speed fluctuation range is larger than a predetermined value, the imbalance due to the laundry in the drum is determined to be large, and the dehydration process is performed. Can be ignored, and large vibration and noise are not generated in the dehydration process.

According to a third aspect of the present invention, in accordance with the second aspect of the present invention, there is provided a cloth amount detecting means for detecting an amount of the laundry in the drum, and the control means is configured to control the amount of the laundry in the drum. When the amount of laundry in the drum is small, even if the laundry in the drum has the same imbalance, even if the laundry in the drum is small, the predetermined value is changed. The effect of unbalance is greater than the inertia caused by the laundry, and the fluctuation range of the rotation speed is larger.However, when the amount of laundry in the drum is large, the imbalance is caused by the drum and the laundry stuck evenly in the drum. Since the rotational speed fluctuation width is reduced by the inertia, the predetermined value for determining the imbalance is changed according to the amount of the laundry, so that the vibration and noise in the dehydration process can be reduced regardless of the amount of the laundry. Can be suppressed .

According to a fourth aspect of the present invention, in the third aspect of the present invention, the laundry amount detecting means detects the amount of the laundry when the laundry is dry at the start of the operation, and detects the amount of the laundry in the drum. The amount of the laundry can be determined at the beginning of the laundry, the amount of the laundry can be determined at the beginning of the laundry, and the predetermined value for determining the imbalance can be changed according to the amount of the laundry from the first dehydration, and the vibration and noise can be changed. Can be suppressed.

According to a fifth aspect of the present invention, in the fourth aspect of the present invention, after the washing step or the rinsing step.
In the first , the laundry in the drum is lifted and dropped
And detangling process at the rotational speed for driving the drum, corresponding to the vibration resonance point such as water tub from said <br/> first rpm
Cloth balance process to gradually third rotational speed lower than the rotational speed increases the rotational speed of the drum, than the following fabric balance stroke, the third higher than the rotational speed and the second rotational speed
And preliminary dewatering step of driving the lower fourth the drum at a rotational speed of, and a unbalance determination step determines imbalance after the preliminary dewatering process, the laundry amount detecting means, again laundry by the preliminary dehydration step of the amount detects, luck in the detection result
The amount of cloth detected at the start of the rotation is corrected, and in the preliminary dehydration process, the laundry contains water, and by detecting the amount of the laundry in this state, vibration in the dehydration process, The amount of clothes can be detected in a state that easily affects noise, and a predetermined value to be determined as imbalance is corrected according to the amount of laundry detected in the same state as the dehydration process by correcting the amount of clothes according to the detection result. It can be changed, and dehydration can be performed with vibration and noise further suppressed in the dehydration process.

[0016] The invention described in claim 6 is the above-mentioned claim 1-
5. The invention according to claim 5 , further comprising input setting means for setting a washing course and the like, wherein a predetermined value is changed by a special operation of said input setting means, and vibration and noise in a dehydration process are provided. Varies depending on the condition of the floor on which the washing machine main body is installed, and so can be dehydrated without generating vibration and noise in the dehydration process by changing a predetermined value according to the installation situation and the like.

[0017]

Embodiments of the present invention will be described below with reference to the drawings. Components having the same configuration as the conventional example are denoted by the same reference numerals, and description thereof is omitted.

Embodiment 1 As shown in FIGS. 1 and 2, a first motor (motor)
15 drives the drum 1 at a first rotational speed N1 (for example, 53
rpm) for washing or rinsing, and the second motor (motor) 16
At a rotation speed N2 (for example, 1000 rpm) for dehydration. The first motor 15 and the second motor 16 are constituted by induction motors, and are connected to driven pulleys 19 via belts 17 and 18, respectively.

The driven pulley 19 has two kinds of reduction ratios. The first motor 15 is connected via a belt 17 to a driven pulley 19a having a large reduction ratio.
6 through the belt 18 to the driven pulley 1 having a small reduction ratio
9b, and is fixed to the other end of the horizontal shaft 4 having one end fixed to the rotation center of the drum 1.

The control device 20 includes a first motor 15, a second motor 15,
The motor 16 is controlled as shown in FIG. The control means 21 is constituted by a microcomputer, and includes a heater 13, a first motor 15, a second motor 16, a water supply valve 23, a drain pump 2 through a power switching means 22 constituted by a bidirectional thyristor or the like.
4 and the like, and sequentially controls a series of steps of washing, rinsing, and dehydration. The heater 13 heats the washing water in the water receiving tub 3, the water supply valve 23 supplies water to the water receiving tub 3, and the drainage pump 24 drains the washing water in the water receiving tub 3.

The input setting means 25 is for inputting a setting course required by the user, start of operation, and the like. The display means 26 displays the contents set by the input setting means 25, the operation state, and the like. The water level detecting means 27 detects the water level in the water receiving tank 3, and the water temperature detecting means 28 detects the water temperature in the water receiving tank 3, and inputs the detected temperatures to the control means 21. The rotation speed detecting means 29
The number of rotations of the drum 1 is detected by detecting the number of rotations of the first motor 15, and is input to the control unit 21. The storage means 30 stores data necessary for a series of controls. In addition, 31 is a commercial power supply, and 32 is a power switch.

Before the dehydration process of driving the drum 1 at the second rotation speed N2, the control means 21 performs a cloth loosening process of driving the drum 1 at the first rotation speed N1, as shown in FIG.
From the first rotation speed N1 to the third rotation speed N3 (for example, 1
00 rpm), and a fourth rotation speed N at which dehydration is possible after the cloth balance process.
4 (for example, 200 rpm), and enters the dehydration process through a pre-dehydration process and an unbalance determination process in which the pre-dehydration process is performed at the third rotation speed N3 to detect and determine the imbalance of the laundry. Like that.

The rotation direction of the drum 1 in the cloth loosening process is set opposite to the rotation direction after the cloth balance process, and the third rotation speed N3 is set to the rotation speed at which the laundry sticks to the inner wall of the drum 1. The fourth rotation speed N4 is a rotation speed lower than the rotation speed corresponding to the vibration resonance point of the water receiving tank 3 or the like.
Is driven by the second motor 16.

In the unbalance determination step, first, the number of revolutions of the first motor 15 is detected by the revolution number detecting means 29, and the first motor 15 is controlled to the third number of revolutions N3 by this detection output. The first motor 15 is driven with the conduction angle of the power switching means 22 fixed at this time. The state of the laundry in the drum 1 is determined based on the rotation speed fluctuation width of the first motor 15 when driven by the fixed conduction angle, and when the rotation speed fluctuation width is large (for example, 3 rpm or more), the inside of the drum 1 is not changed. Is determined to be in an unbalanced state.

The operation of the above configuration will be described.
Is opened and the laundry is put into the drum 1, and the power switch 3
After turning on the water supply valve 23, the start switch (not shown) of the input setting means 25 is operated to start the operation.
Operates to supply water, and when a predetermined water level is detected by the water level detection means 27, the water supply is stopped and the first motor 15 is driven. In the washing process, the drum 1 is rotated at a low speed by the first motor 15 while replenishing water because the laundry contains water, and the laundry in the drum 1 is lifted and dropped on the water surface.

At this time, the heater 13 is energized to heat the washing water in the water receiving tub 3 and the water temperature in the water receiving tub 3 is detected by the water temperature detecting means 28, so that the temperature of the washing water is substantially constant. To control. When the washing process is completed, the drainage pump 24
Operates to drain the washing water in the water receiving tank 3. afterwards,
In the dewatering process via the rinsing process, the drum 1 is driven to rotate at high speed, and the laundry is centrifugally dewatered.

Next, the operation before the washing step or the rinsing step and before the dehydration step is started will be described with reference to FIGS. When the operation is started after the washing process or the rinsing process is completed in step 40 of FIG. 5, a timer built in the control means 21 is started in step 41, and a step 4 is started.
In step 2, the first motor 15 is turned on. At this time, the rotation speed of the drum 1 is set to the first rotation speed N1 (53 rpm), the rotation speed of the first motor 15 is detected by the rotation speed detecting means 29, and the first motor 15 Control. Therefore, the drum 1 is, as shown in FIG.
The cloth rotates at the first rotation speed N1 and the cloth loosening process is started.

At step 43, every predetermined time (for example,
The first motor 15 is turned on and off (8 seconds on, 3 seconds off), and when the time t1 has elapsed in step 44, the cloth balance process starts. At this time, the rotation direction of the drum 1 is opposite to the rotation direction of the drum 1 in the cloth loosening process.

When the time t2 has elapsed in step 45, the rotational speed of the drum 1 is increased at a first increasing speed (for example, 5 rpm per second) in step 46. When the time t3 has elapsed in step 47, the rotation speed of the drum 1 at this time has reached the rotation speed (for example, 83 rpm) stuck to the inner wall of the drum 1 when the amount of laundry in the drum 1 is small.

After the time t3 has elapsed in step 47, the rotational speed of the drum 1 is increased in step 48 to a second rising speed lower than the first rising speed (for example, 2 rpm per second).
And the laundry can be uniformly stuck to the inner wall of the drum 1 even if the amount of the laundry in the drum 1 is the rated capacity. When the time t4 has elapsed in step 49, the rotation speed of the drum 1 at this time should have reached the third rotation speed N3. In step 50, the rotation speed of the drum 1
If the rotation speed N3 has not been reached, the timer is reset in step 51 and the process returns to step 41.

If the rotation speed of the drum 1 has reached the third rotation speed N3 in step 50, a preliminary dehydration process is started, and in step 52, the first motor 15 is turned off.
In step 3, the second motor 16 is turned on. At this time, the second motor 16 drives the commercial power supply 31 with full conduction. Therefore, the laundry in the drum 1 is dehydrated and can be firmly adhered to the inner wall of the drum 1. The second motor 16 is connected to the first motor 15 via belts 17 and 18, and the rotation speed of the drum 1 by the second motor 16 is detected by the rotation speed detecting means 29.

When the rotation speed of the drum 1 reaches the fourth rotation speed N4 in step 54, the second motor 1
6 is turned off, and in step 56, the rotation speed of the drum 1 is N4 '.
(E.g., 110 rpm) until step 57 repeats a predetermined number of times (e.g., three times).
The operation from step 3 to step 56 is repeated, and the laundry in the drum 1 is further dewatered and firmly adhered to the inner wall of the drum 1. Repeating a predetermined number of times in step 57,
The preliminary dewatering process is completed.

Thereafter, an unbalance determination process is started. In step 58, the first motor 15 is turned on, and the rotation speed of the drum 1 is set to the third rotation speed N3.
The number of rotations of the first motor 15 is detected by 9 and the detection output controls the first motor 15 to control the number of rotations of the drum 1 to the third number of rotations N3. When the time t5 has elapsed in step 59, the conduction angle of the power switching means 22 when the rotation speed of the drum 1 is controlled to the third rotation speed N3 is detected in step 60, and the conduction angle is fixed at the detected conduction angle. The first motor 15 is driven. Then, in step 61, the rotation speed fluctuation width at this time is detected by the rotation speed detection means 29.

The fluctuation range of the rotation speed detected in step 62 is compared with a predetermined value (3 rpm). If the fluctuation range of the rotation speed is less than the predetermined value, it is determined that the vibration and noise do not increase even in the dehydration process. After the time t6 has elapsed in step 63, the process proceeds to the next step, that is, the dehydration step in step 64. If the fluctuation range of the rotation speed detected in step 62 is equal to or larger than the predetermined value, it is determined that the vibration and noise increase in the dehydration process, the timer is reset in step 65, and the process returns to step 41. Note that, when performing again, the number of times of driving at the fourth rotation speed N4 in the preliminary dehydration process is one.

As described above, according to the present invention, the rotational speed at which the laundry is stuck to the inner wall of the drum 1 is controlled, the conduction angle at this time is detected, and the drum is driven by the rotational speed fluctuation width when driven at this conduction angle. Since the state of the laundry in the drum 1 is determined, the state of the laundry in the drum 1 can be detected based on the rotation speed fluctuation width in a state where the laundry is stuck to the inner wall of the drum. When the value is larger than the predetermined value, it is determined that the imbalance due to the laundry in the drum 1 is large, so that the shift to the dehydration process can be ignored, and large vibration and noise can be prevented from being generated in the dehydration process.

In the present embodiment, the second motor 16 is turned off when the rotation speed of the drum 1 reaches the fourth rotation speed N4 in the preliminary dehydration process, and when the drum 1 is repeated a predetermined number of times, the preliminary dehydration process is terminated. In the unbalance determination process, the first motor 1
5 is turned on, the second motor 16 is turned off after repeating the predetermined number of times, and when the unbalance determination process is started, the rotation speed of the drum 1 becomes, for example, 120 rpm.
m, the second motor is driven again, and the rotation speed of the drum 1 is controlled to be gently set to 100 rpm.
It becomes 0 rpm or less, and it is possible to prevent the laundry from falling from the inner wall of the drum 1.

In the present embodiment, the first motor 15 and the second motor 16 are constituted by induction motors, but may be commutator motors or the like.

(Embodiment 2) The control means 21 in FIG. 3 inputs the output of the rotation speed detecting means 29 and starts driving the drum 1 by the second motor 16 while the laundry is dry at the start of operation. The amount of laundry in the drum 1 is detected based on the change in the coasting speed of the drum 1. At this time, since the change in the coasting speed of the drum 1 changes due to the tension of the belts 17 and 18, the correction is made based on the change in the rotation speed of the drum 1 when driven by the second motor 16.

The control means 21 changes a predetermined value for determining the imbalance due to the laundry in the drum 1 according to the amount of the laundry in the drum 1. Other configurations are the same as those in the first embodiment.

In the above configuration, first, the operation of detecting the amount of laundry in the drum 1 will be described with reference to FIG.

Put the laundry in the drum 1 and go to step 7
At 0, the operation starts. At step 71, the second motor 16 is turned on with full conduction, and the drum 1 is driven. When the rotation speed of the drum 1 becomes 200 rpm in Step 72, Step 7
At 3, the timer built in the control means 21 is started,
After 3 seconds have elapsed in step 74, the rotation speed N01 of the drum 1 at that time is detected in step 75, and 200 rpm is detected.
The amount of change ΔN1 from is stored, and the timer is reset in step 76. Here, the variation ΔN1 is ΔN1 = N01−200.

In step 77, the rotation speed of the drum 1 is 600
When the rotation speed reaches rpm, the second motor 16 is turned off in step 78. For this reason, the rotation speed of the drum 1 gradually decreases. At this time, the decreasing speed of the rotation speed of the drum 1
There is a correlation with the amount of laundry inside, and when the amount of laundry is large, the rotation speed decreases slowly, and when the amount of laundry is small, the rotation speed decreases rapidly.

In step 79, the rotation speed of the drum 1 is 500
When the rotation speed reaches rpm, the timer is started in step 80, and after 6 seconds have elapsed in step 81, the rotation speed N02 of the drum 1 at this time is detected in step 82, and 500 rpm
The amount of change ΔN2 from pm is stored. Where the amount of change △
N2 is set to ΔN2 = 500−N02. Next, at step 83, the cloth quantity index Ga is calculated by the following equation.

Ga = 0.75 × △ N1 + △ N2 In the above equation, the first term on the right side corrects the influence of the tension of the belts 17 and 18, and the second term indicates that the drum 1 This represents a change in the number of revolutions from 500 rpm. Based on the calculation result, the amount of the laundry in the drum 1 is determined in step 84 as shown in (Table 1). Since the first term on the right side of the above equation is affected by the voltage of the commercial power supply, if it is corrected according to the voltage of the commercial power supply,
Determination accuracy can be improved.

[0045]

[Table 1]

In accordance with the amount of laundry in the drum 1 determined as described above, the control means 21 determines the imbalance due to the laundry in the drum 1 as shown in (Table 2). The predetermined value is changed.

[0047]

[Table 2]

Even if the laundry in the drum 1 has the same imbalance, when the amount of the laundry in the drum 1 is small, the drum 1 and the inertia due to the laundry stuck uniformly in the drum 1 are more unbalanced. Although the influence of balance is large and the rotational speed fluctuation range is large, when the amount of laundry in the drum 1 is large, the imbalance is canceled by the inertia of the drum 1 and the laundry stuck uniformly in the drum 1. Since the fluctuation range of the rotation speed becomes smaller, the predetermined value for determining the imbalance according to the amount of the laundry is changed as shown in (Table 2), so that regardless of the amount of the laundry, Vibration and noise can be suppressed.

Further, since the amount of laundry in the drum 1 is detected in a dry state at the start of operation and the amount of laundry in the drum 1 is used, the amount of laundry is determined at the beginning of the laundry. As a result, the predetermined value for determining imbalance can be changed according to the amount of laundry from the first dehydration, and vibration and noise can be suppressed.

(Embodiment 3) As shown in FIG. 7, the control means 21 in FIG. 3 controls the drum 1 to the first rotation speed N1 before the dehydration process in which the drum 1 is driven at the second rotation speed N2. Cloth loosening process driven by
From the first rotation speed N1 to the third rotation speed N3 (for example, 1
00 rpm), and after the cloth balancing process, the cloth is driven at a fourth rotation speed N4 (for example, 150 rpm) lower than the rotation speed corresponding to the vibration resonance point of the water receiving tank 3 or the like. A first pre-dehydration step,
After the first preliminary dehydration step, a first unbalance determination step that is driven at the third rotation speed N3 to detect and determine the imbalance of the laundry, and after the first unbalance determination step,
A second preliminary spin-drying step driven at a fifth rotational speed N5 (for example, 500 rpm) higher than the rotational frequency corresponding to the vibration resonance point of the water receiving tank 3 and the like; , And enters a dehydration process through a second imbalance determination process which is driven at the rotation speed N3 to detect and determine the imbalance of the laundry.

When the laundry is dry at the start of operation, the control means 21 receives the output of the rotation speed detecting means 29 and drives the drum 1 by the second motor 16 to coast the rotation of the drum 1. The amount of laundry in the drum 1 is detected based on a change in the number, and in a first unbalance determination step, a predetermined value for determining imbalance is changed according to the detected amount of laundry. In the second pre-dehydration step, the amount of the laundry is detected again, the amount of the cloth is corrected based on the detection result, and in the second unbalance determination step, a predetermined value for determining the unbalance in accordance with the corrected amount of the laundry. Is changing. Other configurations are the same as those in the first or second embodiment.

The operation of the above configuration will be described with reference to FIG. The operation up to the cloth balance process is the same as the operation of the first embodiment, and the description is omitted.

At time t4, the first motor 15 is turned off, the second motor 16 is driven in full conduction to enter the first preliminary dehydration step, and the rotation speed of the drum 1 is increased to the fourth rotation speed N4 (150
(rpm), the second motor 16 is turned off, and when the rotation speed of the drum 1 reaches N3 (100 rpm), the first motor 15 is turned on, and the first unbalance determination process is started. At this time, the rotation speed of the drum 1 is set to the first rotation speed N3.
(100 rpm), the number of revolutions of the first motor 15 is detected by the revolution number detecting means 29, and the first motor 15 is controlled by this detection output.

When the time t5 has elapsed, the conduction angle of the power switching means 22 when the rotation speed of the drum 1 is controlled to the third rotation speed N3 is detected, and the first motor is fixed at the detected conduction angle. 15 is driven. Then, the rotation speed fluctuation width at this time is detected by the rotation speed detection means 29, and the detected rotation speed fluctuation width is compared with a predetermined value. At this time,
The predetermined value is changed as shown in (Table 2) according to the amount of laundry in the drum 1 determined at the start of the operation.

When the rotation speed fluctuation range is equal to or less than the predetermined value, the imbalance of the laundry in the drum 1 is small, and the fifth rotation speed N5 is higher than the rotation speed corresponding to the vibration resonance point of the water receiving tub 3 or the like. It is determined that driving is possible, and after the time t6 has elapsed, the first motor 15 is turned off, the second motor 16 is driven in full conduction, and the second pre-dehydration step is started. If the rotation speed fluctuation width is equal to or more than the predetermined value, it is determined that the motor cannot be driven at the fifth rotation speed N5 higher than the rotation speed corresponding to the vibration resonance point of the water receiving tank 3 or the like, and the process returns to the cloth loosening process.

When the rotation speed of the drum 1 reaches the fifth rotation speed N5 (500 rpm) in the second pre-dehydration step,
The second motor 16 is turned off, and the rotation speed of the drum 1 is reduced to N3.
(100 rpm), the first motor 15 is turned on, and the second unbalance determination process is started.

In the second preliminary dewatering step, the second motor 1
6 at full conduction, and the rotation speed of the drum 1 is 200 rpm
, The rotation speed N of the drum 1 when 3 seconds have elapsed
01, the amount of change △ N1 from 200 rpm (here, △ N1 = N01−200) is stored, the rotation speed of the drum 1 becomes 500 rpm, and the second motor 16 is turned off. The rotation speed N02 of the drum 1 is detected when six seconds have elapsed since the rotation speed of the drum 1 became 450 rpm, and the change amount ΔN2 from 450 rpm (here, ΔN
2 = 450−N02), and the cloth quantity index Ga is calculated by the following equation.

Ga = 0.75 × △ N1 + △ N2 In the above equation, the first term on the right-hand side corrects the influence of the tension of the belts 17 and 18, and the second term shows the effect of the drum 1 in six seconds. This represents a change in the number of revolutions from 450 rpm. Based on this calculation result, as shown in (Table 3),
The amount of laundry in the drum 1 is determined.

[0059]

[Table 3]

In the second pre-drying step, the laundry contains water, and by detecting the amount of the laundry in this state, the amount of the cloth is detected in a state in which vibration and noise in the dehydrating step are easily affected. can do.

In the second unbalance determination step, the drum 1
Is set to the third rotation speed N3 (100 rpm), the rotation speed of the first motor 15 is detected by the rotation speed detecting means 29, and the first motor 15 is controlled by this detection output. When the time t7 has elapsed, the conduction angle of the power switching means 22 when the rotation speed of the drum 1 is controlled to the third rotation speed N3 is detected, and the first motor 15 is driven by fixing the conduction angle to the detected conduction angle. I do. Then, the rotation speed fluctuation width at this time is detected by the rotation speed detecting means 29.

Next, the detected rotation speed fluctuation width is compared with a predetermined value. If the rotation speed fluctuation width is equal to or smaller than the predetermined value, the imbalance of the laundry in the drum 1 is small, and even when the dehydration process is started. It is determined that the vibration and noise do not increase, and the time t8
After elapse, the process proceeds to the dehydration process. At this time, as shown in (Table 4), the predetermined value depends on the amount of laundry in the drum 1 containing water determined in the second preliminary spin-drying process.
Change the predetermined value.

[0063]

[Table 4]

If the detected rotational speed fluctuation width is equal to or larger than the predetermined value, it is determined that vibration and noise increase when the dehydration process is started, and the process returns to the cloth loosening process.

As described above, according to the present invention, when the laundry is dry at the start of the operation, the amount of the laundry in the drum 1 is detected, and the detected amount of the laundry is determined in the first unbalance determination step. The predetermined value for determining the unbalance is changed in accordance with the above, the amount of the laundry is detected again in the second preliminary dehydration process, and the amount of the laundry is corrected based on the detection result. Therefore, the predetermined value for determining the imbalance is changed in accordance with the corrected amount of the laundry, so that the predetermined value for determining the imbalance is determined according to the amount of the laundry detected in the same state as the dehydration process. It can be changed, and dehydration can be performed with vibration and noise further suppressed in the dehydration process.

In this embodiment, when the rotation speed of the drum 1 reaches the fourth rotation speed N4 or the fifth rotation speed N5 in the first or second preliminary dewatering process, the second motor 16 is turned off. And enters the first or second unbalance determination step,
Although the first motor 15 is turned on, when the second motor 16 is turned off and the first or second unbalance determination process is started, the rotation speed of the drum 1 becomes, for example, 1
When the rotation speed of the drum 1 drops to 20 rpm, the second motor is re-driven, and the rotation speed of the drum 1 is controlled to gently increase to 100 rpm. 1 can be prevented from falling from the inner wall.

(Embodiment 4) When there is no cloth amount detection result, the control means 21 in FIG. 3 sets a predetermined value to a minimum value (for example, 3 rpm). Other configurations are the same as those of the second or third embodiment.

The operation of the above configuration will be described. When there is no cloth amount detection result, the amount of the laundry in the drum 1 is not known. Can drum 1
Regardless of the amount of laundry inside, dehydration can be performed without generating vibration and noise during the dehydration process.

(Embodiment 5) When the laundry is made of easily shrinkable fiber such as hair, blanket, or the like, the control means 21 in FIG.
The predetermined value is set to another value. Other configurations are the same as those of the second or third embodiment.

[0070]

[Table 5]

The operation of the above construction will be described. When the laundry is made of easily shrinkable fibers such as hair, the size of the laundry, the degree of water absorption and the like are different from those of ordinary cotton, synthetic fiber and the like. In order to reduce the shrinkage of the object and to increase the rotation speed of the drum 1 in the dehydration process only up to 500 rpm, the predetermined value is set as shown in (Table 5), so that the imbalance in the dehydration process is achieved. In the determination process, when the fluctuation range of the rotation speed of the drum 1 becomes larger than a predetermined value, the process returns to the fabric loosening process so that the process of rebalancing is not performed, and dehydration is performed without generating vibration and noise. be able to.

In the case of a blanket, it is easy to balance in the drum 1. By setting a predetermined value as shown in (Table 5), the fluctuation of the rotation speed of the drum 1 in the unbalance determination step in the dewatering step is performed. When the width becomes larger than the predetermined value,
It is possible not to return to the cloth loosening process and perform the balancing process again, and it is possible to perform dehydration without generating vibration and noise.

(Embodiment 6) As shown in FIG. 8, the input setting means 25 in FIG.
A washing time setting switch 25a, a rinsing number setting switch 25b, a dehydration time setting switch 25c, a course changeover switch 25d, a start / pause switch 25e, and the like are provided.
a, a rinsing frequency display lamp 26b, a dehydration time display lamp 26c, a course display lamp 26d, a course switching display lamp 26e, a remaining time display lamp 26f, and the like.

When the power switch 32 is turned on while the dewatering time setting switch 25c and the course changeover switch 25d are turned on at the same time, a mode for changing a predetermined value for judging imbalance in the unbalance judging process is entered. Other configurations are the same as those in the first or second embodiment.

The operation of the above configuration will be described. The dehydration time setting switch 25c and the course changeover switch 25
When the power switch 32 is turned on while d is simultaneously turned on, a mode for changing a predetermined value for determining imbalance is entered, "P10" is displayed on the remaining time display lamp 26f, and the rinsing number setting switch 25b is turned once. Each time the power is turned on, the display of the remaining time display lamp 26f changes to “P11”, “P11
12 "," P13 ", and so on. The display of the remaining time display lamp 26f and the predetermined value for determining the imbalance are:
As shown in (Table 6), the remaining time display lamp 26 is operated by operating the rinse number setting switch 25b.
By changing the display of f, the predetermined value for determining imbalance can be changed.

[0076]

[Table 6]

Therefore, by changing the predetermined value according to the installation condition of the washing machine main body, it is possible to perform dehydration without generating vibration and noise in the dehydration process.

[0078]

As described above, according to the first aspect of the present invention, laundry is stored and the laundry is lifted by rotation.
A rotatable drum to wash by dropping
A motor for driving the drum,
A water receiving tank supported on the body of the rinsing machine with vibration isolation, and the motor
Moving power switching means, rotation speed detection means for detecting the rotation speed of the motor, and rotation speed detection means.
And the power switching means.
Control means for controlling a conduction angle of the drum, wherein the control means corresponds to a vibration resonance point of the drum such as the water receiving tank.
And the laundry is stretched on the inner wall of the drum.
Before when controlled to rotate at a predetermined rotation speed stick Ri
By detecting the conduction angle of the power switching means and comparing the rotation speed fluctuation width of the motor when the motor is driven with the conduction angle with a predetermined value, the state of imbalance due to the laundry in the drum is determined. Judgment imbalance
Because I have a determined stroke, the rotational speed variation range when driven with a constant conduction angle state of the laundry in the drum can be detected accurately by, it is possible to determine whether to transition to the dehydration step When the laundry is dry,
It is the number of rotations that stick to the inner wall of the
Without changing the state of sticking to the drum inner wall,
The state of the laundry in the drum with the rotation speed fluctuation width at the rotation speed
Therefore, it is possible to accurately determine whether or not the transition to the dehydration process is possible, and to prevent large vibration and noise from being generated in the dehydration process.

[0079] According to the invention described in claim 2, the control means is the imbalance determination step, when times <br/> rotation speed fluctuation width of the motor is greater than a predetermined value, due to the laundry in the drum The imbalance is judged to be large and the drum is
Second rotation higher than the rotation speed corresponding to the vibration resonance point of the tank
Because we did not shift to the dehydration process that rotates with the number of turns ,
When the rotational speed fluctuation range is larger than a predetermined value, it is determined that the imbalance due to the laundry in the drum is large, so that the shift to the dehydration process is not performed, and large vibration and noise are not generated in the dehydration process. Can be.

According to the third aspect of the present invention, there is provided a cloth amount detecting means for detecting the amount of laundry in the drum, and the control means sets a predetermined value in accordance with the amount of laundry in the drum. Since it is changed, it is possible to suppress vibration and noise during the dehydration process regardless of the amount of laundry.

According to the fourth aspect of the present invention, the laundry amount detecting means detects the amount of the laundry when the laundry is dry at the start of the operation and determines the amount of the laundry in the drum. The amount of laundry can be determined at the beginning of washing, and a predetermined value for determining imbalance can be changed according to the amount of laundry from the first dehydration, thereby suppressing vibration and noise.

According to the fifth aspect of the present invention, washing is performed.
In or rinse after the stroke after the extent濯行, laundry in the drum
And detangling process for <br/> driving the drum at a first rotation speed to drop to lift the object, receiving water from said first rotational speed
Cloth balance process gradually increases the rotational speed of the drum to a third rotational speed lower than the speed corresponding to the vibration resonance point such as tank, after the cloth balance stroke, the third rotation speed
Higher and the second lower than the rotational speed fourth of said at rpm
It includes a preliminary dewatering step for driving the drum, and the preliminary dewatering process unbalance determination step determines imbalance after, the laundry amount detecting means detects the amount of re laundry by the preliminary dehydration step, the detection Since the amount of cloth detected at the start of operation is corrected based on the result, the predetermined value to be determined as imbalance can be changed according to the amount of laundry detected in the same state as the dehydration process, and vibration, Dehydration can be further suppressed with noise.

According to the sixth aspect of the present invention, there is provided an input setting means for setting a washing course or the like, and the predetermined value is changed by a special operation of the input setting means. Since the noise also changes depending on the condition of the floor on which the washing machine body is installed, the dehydration can be performed without generating vibration and noise in the dehydration process by changing a predetermined value according to the installation situation. .

[Brief description of the drawings]

FIG. 1 is a sectional view of a washing machine according to a first embodiment of the present invention.

FIG. 2 is a partially cutaway rear view of the washing machine.

FIG. 3 is a block circuit diagram of the washing machine.

FIG. 4 is an operation time chart of main parts of the washing machine.

FIG. 5 is an operation flowchart of main parts of the washing machine.

FIG. 6 is a flowchart of a washing machine according to a second embodiment of the present invention at the time of detecting a cloth amount.

FIG. 7 is an operation time chart of a main part of a washing machine according to a third embodiment of the present invention.

FIG. 8 is a front view of an operation display unit of a washing machine according to a sixth embodiment of the present invention.

FIG. 9 is a cross-sectional view of a conventional dehydrating and washing machine.

[Explanation of symbols]

1 drum 15 First motor (motor) 16 Second motor (motor) 21 Control means

────────────────────────────────────────────────── ─── Continuation of front page (56) References JP-A-8-309077 (JP, A) JP-A-8-19684 (JP, A) JP-A-5-168786 (JP, A) JP-A-5-168786 31292 (JP, A) JP-A-5-293289 (JP, A) JP-A-3-224594 (JP, A) JP-A-63-135194 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) D06F 33/02 D06F 58/28

Claims (6)

(57) [Claims] 1. The laundry is stored and the laundry is rotated.
A rotatable drum for washing by lifting and dropping, a motor for driving the drum,
A water receiving tank that is contained and is supported by the main body of the washing machine in a vibration-proof manner;
A power switching unit for driving the motor, a rotation speed detection unit for detecting a rotation speed of the motor, and the rotation speed detection.
Means for inputting a signal from
Control means for controlling the conduction angle of the oscillating means, wherein the control means is arranged so that the drum has a vibration resonance point such as the water receiving tank.
The rotation speed is lower than the rotation speed corresponding to
It is controlled to rotate at a predetermined number of rotations sticking to the wall
Detecting the conduction angle of the power switching means at the time of driving, and comparing the fluctuation range of the rotation speed of the motor when the motor is driven with the conduction angle with a predetermined value, thereby washing the inside of the drum. Amber to determine the state of imbalance due to objects
Washing machine have a lance judgment stroke. As claimed in claim 1, wherein the control means is, your unbalanced judgment stroke
When the rotation speed fluctuation range of the motor is larger than a predetermined value ,
Judging that the imbalance due to the laundry in the drum is large ,
Number of rotations of the drum corresponding to the vibration resonance point of a water receiving tank
Higher second washing machine according to claim 1 Symbol placement was migrated not <br/> so the dehydrating operation to rotate at a rotational speed. 3. The washing machine according to claim 2, further comprising cloth amount detecting means for detecting an amount of laundry in the drum, and wherein the control means changes a predetermined value according to the amount of laundry in the drum. . 4. The washing machine according to claim 3 , wherein the laundry amount detecting means detects the amount of the laundry when the laundry is dry when the operation is started, and determines the amount of the laundry in the drum. 5. The control means according to claim 1, wherein said control means is provided after a washing step or a rinsing step.
Later, the laundry in the drum is lifted and dropped.
And detangling stroke to drive the drum at a first rotational speed that, the vibration resonance point such as water tub from said first rotational speed
Corresponding lower than the rotational speed of the third progressively the gong to the speed of
A cloth balance step for increasing the number of revolutions of the system, and after this cloth balance step, the second
Determining a preliminary dehydration step, the imbalance after the preliminary dehydration step for driving the drum at a fourth rotation speed lower than the rotation number of
And a cloth amount detecting means,
Wherein detecting the amount of re laundry preliminary dewatering process, the washing machine according to claim 4, wherein which is adapted to correct the cloth amount is detected at the start of operation in the detection result. Further comprising: a input setting means for setting a like washing course, a washing machine according to any one of claims 1 to 5 to alter the predetermined value by a special operation of the input setting unit.